A driver circuit arrangement for driving a load and a differential drive arrangement thereof are provided. The driver circuit arrangement employs a dual feedback configuration with a feedback resistor and a current sensor feedback arrangement. The current sensor feedback arrangement provides a current feedback path from the amplifier output to the amplifier input, and has a current sensor resistor connected in an output current path of the driver circuit arrangement. A current feedback amplifier is present connected to the current sensor resistor and to the amplifier input.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The driver circuit arrangement according to claim 1, wherein the output impedance value REXT has a value between 5Ω and 10Ω.
3. The driver circuit arrangement according to claim 1, wherein the amplification factor N has a value between 10 and 1000.
4. The driver circuit arrangement according to claim 1, wherein the amplification factor N has a value of 200.
5. The driver circuit arrangement according to claim 1, wherein the capacitive load has a value between 1 μF and 8 μF.
8. The driver circuit arrangement according to claim 7, wherein the current feedback amplifier has a secondary multiplication factor equal to N/RFB, RFB being the value of the feedback resistor, and N has a value between 10 and 1000.
9. The driver circuit arrangement according to claim 7, wherein the current feedback amplifier has a secondary multiplication factor equal to N/RFB, RFB being the value of the feedback resistor, and N has a value of 200.
10. The driver circuit arrangement according to claim 1, further comprising an external inductor connected between the amplifier output and the load, wherein the external inductor is configured to tune a frequency response of a combination of external inductor and the load.
11. The driver circuit arrangement according to claim 1, wherein the load is a piezo-electric driver, and/or a piezo-electric loudspeaker.
12. The driver circuit arrangement according to claim 1, wherein the load is a piezo-electric loudspeaker and the piezo-electric loudspeaker is attached to the back of a smartphone display.
13. A differential drive arrangement for driving a load having two terminals, comprising a driver circuit arrangement according to claim 1 for each of the two terminals.
14. The differential drive arrangement according to claim 13, the driver circuit arrangements having positive and negative voltage swings.
15. The differential drive arrangement according to claim 13, wherein the load is driven with opposite phase signals.
17. The driver circuit arrangement according to claim 16, wherein the class-D amplifier comprises a second order or higher PWM feedback loop.
19. The driver circuit arrangement according to claim 18, wherein the class-D amplifier comprises a first order PWM feedback loop.
20. The driver circuit arrangement according to claim 18, wherein the class-D amplifier comprises a second order or higher PWM feedback loop.
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September 8, 2021
November 26, 2024
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